Valve.



' fNo.7|4,4|o. Patented Nov. 25, 1902.

vC. H. STANTON, P. M. ARMSTRONG & J. H.l PRWSE.

H VALVE.

\App1ication'1ed Mat. 3, 1902.)

(No` `Nudel.)

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UNITED STATES ATENT EFICE.

CHARLES HOWELL STAINTON, PETER MAROHALL ARMSTRONG, AND JAMES II. PROWSE,OF TORONTO, CANADA.

SPECIFICATION forming part of Letters Patent No. 714,410, dated November25, 1902. Application iiled March 3, 1902. Serial No. 96,563. (Nomodel.)

l l I valve in which the middle part of the plug is `cut away, leavingcircular ends connected by a central web. The ends of the web are ofexactly the same width as the raised seats against which they fit, `sothat scale cannot 2,0 accumulate on any portion of the seats while thevalve is closed. The seats are raised above the inner surface of thevalve-body, i or perhaps we might say have sides running at an anglewith the faces of the seats. The

. best results are obtained when the sides of each seat liesubstantially in planes radial` from the axis of the plug, as scalecollecting on the sides is thus presented to the working faces of theweb at a very inefficient angle i 3o for cutting, and the wear on thefaces is thus minimized, substantially as hereinafter more specificallydescribed and then definitely claimed.

Figure lis a vertical section of our improved t valve. Fig. 2 is ahorizontal section of the saine. i

In the drawings like letters of reference ini dicate corresponding partsin both figures.

` A is the body of the valve, of ordinary con i 4o struction andsuitably recessed to receive the taper-plug E. This plug is held inposition in the ordinary manner by means of the screw-cap B and packingC; The plug E, itV

will benoticed, is circular at the ends; but the central portion is cutaway on each side, leaving the web G. The faces of the ends of this webare less in width than the diameter of the central passage of the valve,so that when the plug is turned to a position at right 5o angles to theposition shown in the drawings a clear passage-way for water or steam isleft that the valve-seats D D are raised above the inner surface of thebody of the valve-that is to say, each seat has well-defined ysidesrunning back from the workingface of the seat at such an angle thatscaleformingon the sides is present-ed toward the opposed face of theend of the web of the plug at a very inefficient angle for cutting theends of the web of the plug. We prefer that these sides should liesubstantially in planes radial from the center of the plug, though theymight vary somewhat on either side of such plane without inatcriallyspoiling the working of the valve. We might here explain that the chiefdifficulty in making a plug-valve which will remain iight after it hasbeen iu use sonne time in connection with a steam-boiler lies in thefact that scale forms on all the exposed parts of the interior of thevalve while the latter is in a closed position. When the plugisoperated, this scale with all ordinary valves cuts the working faces andsoon produces leakage.

We have overcome this difficulty by the following features ofconstruction. In the first place the working faces of the web of theplug and the valve-seats are of exactly thesame width, so that no scalecan form upon them. Scale, however, does form on the sides of thevalve-seats, extending over onto the sides of the plug in a continuoussheet if the valve be left closed for some time. lf now the plug beturned, this scale is broken at the point of juncture between the sidesof the plug and the valve-seats, and a rough jagged edge of extremelyhard scale is left attached to the sides, which cuts and scores theworking faces of the ends of the web unless the valve-seat be raised andits sides set substantially at the angle already described. It is wellknown that if one hard substance is to cut another it must be set sothat its cutting edge is at" IOO an acute angle to the surface to becut, as eX- ernplied in the position of a plane-iron. We find,therefore,that with the sides of the valveseat set at the angle described thescale does not cut the Wearing-faces of the Web of the plug both onaccount of the angle at Which it is thus presented to the ends of theweb and on account of the comparative ease with which the movement ofthe plug when the valve is opened will strip the scale away from thepoint of juncture between the Web and the seats, and thus leave littleor no scale to act on the ends of the Web. As a matter of fact We ind inpractice that when our valve is used as a boiler bloW-oi it remainsunimpaired for months, While blow-off valves of ordinary types Willbecome leak-y in the course of a very few Weeks. It Will be seen onreference to Fig. l that the taper-plug E is provided With a stem H, ofordinary construction, having irs projecting end square to receive awrench for opening and closing the valve. A groove is cut at the topcircular portion of the plug opposite a small groove J in the body ofthe valve, the channel thus formed being designed to receive a ball K,which runs therein and forms a stop to prevent the plug being turnedbeyond the position to properly close it; but We claim nothing for thispar ticular construction.

What We claim as our invention is l. In a cut-olf valve a taper-plughaving circular ends connected by a web in combination with a valve-bodyadapted to receive the said plug and provided with raised valve- Iseats,one at each side of its central passage,

of the same Width as the ends of the said web, substantially asdescribed. l

2. In a cut-o valve a taper-plug having circular ends connected by aWeb, the ends of the Web being less in Width than the diameter of thecentral passage of the valve in comhination with a valve-body adapted toreceive the said plug and provided with raised valveseats, one at eachside of its central passage of the same width as the ends of the saidweb substantially as described.

3. In a cut-oit valve a taper-plug having circular ends connected by aweb in combination with a valve-body adapted to receive the said plugand provided with raised valveseats, one at each side of its centralpassage, of the same Width as the ends of the said web, the sides of theseats lying substantially in planes radial from the axis of the plugsubstantially as described.

4. In a cut-off valve a taper-plug having circular ends connected by aweb, the ends of the web being less in Width than the diameter of thecentral passage of the valve,in cornbnation With a valve-body adapted toreceive the said plug and provided with raised valveseats of the samewidth as the ends of the said web, the sides ot the seats beingsubstantially in planes radial from the axis of the plug, substantiallyas described.

5. In a cut-O valve a taper-plug having circular ends connected by aWeb, the ends of the web being less in Width than the diameter of thecentral passage of the valve, in combination With a valve-body adaptedto receive the said plug and provided with raised valveseats of the samewidth as the ends of the said web each side of each seat joining theface at an angle which will not give scale forming on the side aneffective cutting angle against the end of the web engaging the facesubstantially as described.

Dated at Toronto, February 10, 1902.

CHARLES HOWELL STAINTON. PETER MARCHALL ARMSTRONG. JAMES H. PROWSE.

Witnesses:

LEONARD FoULDs, HERBERT STAINTON.

